Zipper and the packaging therewith
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United States of America Patent
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Jul 24, 2007
Grant Date -
Sep 28, 2006
app pub date -
Mar 24, 2005
filing date -
Mar 24, 2005
priority date (Note) -
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Abstract
[PROBLEM] To provide a interlocking device and a packaging bag therewith wherein the interlocking device has sufficient heat stability against retort sterilization treatment and deformational change after said treatment small enough not to be impaired its reopenability.[SOLUTION MEANS] A interlocking device having a pair of male and female profiles wherein: said male and female profiles have non-heat-sealing part to bag body and heat-sealing part to bag body; where said non-heat-sealing part consists of polypropylene type resin composition (A) having main melting peak temperature observed by differential scanning calorimetry less than 150 degree C. and the melt flow rate at 230 degree C. from 0.5 g/10 min to 20 g/10 min; and said heat-sealing part consists of polypropylene type resin composition (B) having main melting peak temperature observed by DSC, not less than 140 degree C. and the melt flow rate at 230 degree C. from 0.1 g/10 min to 20 g/10 min; and the main melting peak temperature of polypropylene type resin composition (B) is at least 10 degree C. lower than that of polypropylene type resin composition (A), and a packaging bag with interlocking device wherein the aforesaid interlocking device is heat-sealed to the bag body via said heat sealing part.
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